Abstract
The centromere is a multi-functional complex comprising centromeric DNA and a number of proteins. To isolate unidentified centromeric DNA sequences, centromere-specific histone H3 variants (CENH3) and chromatin immunoprecipitation (ChIP) have been utilized in some plant species. However, anti-CENH3 antibody for ChIP must be raised in each species because of its species specificity. Production of the antibodies is time-consuming and costly, and it is not easy to produce ChIP-grade antibodies. In this study, we applied a HaloTag7-based chromatin affinity purification system to isolate centromeric DNA sequences in tobacco. This system required no specific antibody, and made it possible to apply a highly stringent wash to remove contaminated DNA. As a result, we succeeded in isolating five tandem repetitive DNA sequences in addition to the centromeric retrotransposons that were previously identified by ChIP. Three of the tandem repeats were centromere-specific sequences located on different chromosomes. These results confirm the validity of the HaloTag7-based chromatin affinity purification system as an alternative method to ChIP for isolating unknown centromeric DNA sequences. The discovery of more than two chromosome-specific centromeric DNA sequences indicates the mosaic structure of tobacco centromeres.
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Abbreviations
- 2, 4-D:
-
2, 4-Dichlorophenoxyacetic acid
- ANOVA:
-
Analysis of variance
- CENH3:
-
Centromere-specific histone H3 variant
- ChIP:
-
Chromatin immunoprecipitation
- ChIP-qPCR:
-
Real-time quantitative PCR with ChIP DNA
- DAPI:
-
4,6-Diamino-2-phenylindole
- FISH:
-
Fluorescence in situ hybridization
- HFD:
-
Histone fold domain
- PBS:
-
Phosphate-buffered saline
- PMSF:
-
Phenylmethylsulfonyl fluoride
- qPCR:
-
Real-time quantitative PCR
- Tukey HSD:
-
Tukey’s Honestly Significant Difference
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Acknowledgments
This work was supported by the Program for the Promotion of Basic and Applied Researches for Innovations in Bio-oriented Industry (BRAIN). Seeds of N. tabacum were kindly provided by the Japan Tobacco Inc. pGWB2 vector was a kind gift from Dr. Nakagawa of Shimane University, Japan.
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Communicated by K. Toriyama.
K. Nagaki and F. Shibat contributed equally to this work.
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Nagaki, K., Shibata, F., Kanatani, A. et al. Isolation of centromeric-tandem repetitive DNA sequences by chromatin affinity purification using a HaloTag7-fused centromere-specific histone H3 in tobacco. Plant Cell Rep 31, 771–779 (2012). https://doi.org/10.1007/s00299-011-1198-4
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DOI: https://doi.org/10.1007/s00299-011-1198-4